Drobo Beyond Raid 4-Bay USB 2.0/FireWire 800 SATA 6GB/S Storage Array with Drobo PC Backup DR04DD10 Mix n match drive capacities Hot expandable up to 16TB Enhanced USB 2.0 performance FireWire 800 (FireWire 400 compatible) Redundant data protection FireWire 800 (FireWire 400 compatible) Enhanced USB 2.0 performance Redundant data protection Hot expandable up to 16TB Mix n match drive capacities